minix/drivers/fb/fb.c

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#include <minix/fb.h>
#include <minix/chardriver.h>
#include <minix/drivers.h>
#include <minix/ds.h>
#include <minix/sysutil.h>
#include <minix/type.h>
#include <minix/vm.h>
#include <sys/ioc_fb.h>
#include <assert.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <dev/videomode/videomode.h>
#include <dev/videomode/edidvar.h>
#include <dev/videomode/edidreg.h>
#include "logos.h"
#include "fb_edid.h"
#include "fb.h"
/*
* Function prototypes for the fb driver.
*/
static int fb_open(devminor_t minor, int access, endpoint_t user_endpt);
static int fb_close(devminor_t minor);
static ssize_t fb_read(devminor_t minor, u64_t pos, endpoint_t ep,
cp_grant_id_t gid, size_t size, int flags, cdev_id_t id);
static ssize_t fb_write(devminor_t minor, u64_t pos, endpoint_t ep,
cp_grant_id_t gid, size_t size, int flags, cdev_id_t id);
static int fb_ioctl(devminor_t minor, unsigned long request, endpoint_t ep,
cp_grant_id_t gid, int flags, endpoint_t user_ep, cdev_id_t id);
static void paint_bootlogo(int minor);
static void paint_restartlogo(int minor);
static void paint_centered(int minor, char *data, int width, int height);
static int do_get_varscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid);
static int do_put_varscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid);
static int do_get_fixscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid);
static int do_pan_display(int minor, endpoint_t ep, cp_grant_id_t gid);
static int keep_displaying_restarted(void);
/* SEF functions and variables. */
static void sef_local_startup(void);
static int sef_cb_init(int type, sef_init_info_t *info);
static int sef_cb_lu_state_save(int);
static int lu_state_restore(void);
/* Entry points to the fb driver. */
static struct chardriver fb_tab =
{
.cdr_open = fb_open,
.cdr_close = fb_close,
.cdr_read = fb_read,
.cdr_write = fb_write,
.cdr_ioctl = fb_ioctl
};
/** Represents the /dev/fb device. */
static int has_restarted = 0;
static u64_t has_restarted_t1, has_restarted_t2;
static int open_counter[FB_DEV_NR]; /* Open count */
static int
fb_open(devminor_t minor, int UNUSED(access), endpoint_t UNUSED(user_endpt))
{
int r;
static int initialized = 0;
static struct edid_info info;
static struct edid_info *infop = NULL;
if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
if (!initialized) {
r = fb_edid_read(minor, &info);
infop = (r == 0) ? &info : NULL;
}
if (arch_fb_init(minor, infop) == OK) {
open_counter[minor]++;
if (!initialized) {
if (has_restarted) {
read_frclock_64(&has_restarted_t1);
paint_restartlogo(minor);
} else {
paint_bootlogo(minor);
}
initialized = 1;
}
return OK;
}
return ENXIO;
}
static int
fb_close(devminor_t minor)
{
if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
assert(open_counter[minor] > 0);
open_counter[minor]--;
return OK;
}
static ssize_t
fb_read(devminor_t minor, u64_t pos, endpoint_t ep, cp_grant_id_t gid,
size_t size, int UNUSED(flags), cdev_id_t UNUSED(id))
{
struct device dev;
int r;
if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
assert(open_counter[minor] > 0);
arch_get_device(minor, &dev);
if (size == 0 || pos >= dev.dv_size) return 0;
if (pos + size > dev.dv_size)
size = (size_t)(dev.dv_size - pos);
r = sys_safecopyto(ep, gid, 0, (vir_bytes)(dev.dv_base + (size_t)pos),
size);
return (r != OK) ? r : size;
}
static int
fb_ioctl(devminor_t minor, unsigned long request, endpoint_t ep,
cp_grant_id_t gid, int UNUSED(flags), endpoint_t UNUSED(user_ep),
cdev_id_t UNUSED(id))
{
/* Process I/O control requests */
int r;
if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
switch(request) {
case FBIOGET_VSCREENINFO:
r = do_get_varscreeninfo(minor, ep, gid);
return r;
case FBIOPUT_VSCREENINFO:
r = do_put_varscreeninfo(minor, ep, gid);
return r;
case FBIOGET_FSCREENINFO:
r = do_get_fixscreeninfo(minor, ep, gid);
return r;
case FBIOPAN_DISPLAY:
r = do_pan_display(minor, ep, gid);
return r;
}
return ENOTTY;
}
static int
do_get_varscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid)
{
int r;
struct fb_var_screeninfo fbvs;
if ((r = arch_get_varscreeninfo(minor, &fbvs)) == OK) {
r = sys_safecopyto(ep, gid, 0, (vir_bytes) &fbvs, sizeof(fbvs));
}
return r;
}
static int
do_put_varscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid)
{
int r;
struct fb_var_screeninfo fbvs_copy;
if (has_restarted && keep_displaying_restarted()) {
return EAGAIN;
}
if ((r = sys_safecopyfrom(ep, gid, 0, (vir_bytes) &fbvs_copy,
sizeof(fbvs_copy))) != OK) {
return r;
}
return arch_put_varscreeninfo(minor, &fbvs_copy);
}
static int
do_pan_display(int minor, endpoint_t ep, cp_grant_id_t gid)
{
int r;
struct fb_var_screeninfo fbvs_copy;
if (has_restarted && keep_displaying_restarted()) {
return EAGAIN;
}
if ((r = sys_safecopyfrom(ep, gid, 0, (vir_bytes) &fbvs_copy,
sizeof(fbvs_copy))) != OK) {
return r;
}
return arch_pan_display(minor, &fbvs_copy);
}
static int
do_get_fixscreeninfo(int minor, endpoint_t ep, cp_grant_id_t gid)
{
int r;
struct fb_fix_screeninfo fbfs;
if ((r = arch_get_fixscreeninfo(minor, &fbfs)) == OK) {
r = sys_safecopyto(ep, gid, 0, (vir_bytes) &fbfs, sizeof(fbfs));
}
return r;
}
static ssize_t
fb_write(devminor_t minor, u64_t pos, endpoint_t ep, cp_grant_id_t gid,
size_t size, int UNUSED(flags), cdev_id_t UNUSED(id))
{
struct device dev;
int r;
if (minor < 0 || minor >= FB_DEV_NR) return ENXIO;
assert(open_counter[minor] > 0);
if (has_restarted && keep_displaying_restarted())
return EAGAIN;
arch_get_device(minor, &dev);
if (size == 0 || pos >= dev.dv_size) return 0;
if (pos + size > dev.dv_size)
size = (size_t)(dev.dv_size - pos);
r = sys_safecopyfrom(ep, gid, 0,
(vir_bytes)(dev.dv_base + (size_t)pos), size);
return (r != OK) ? r : size;
}
static int
sef_cb_lu_state_save(int UNUSED(state)) {
/* Save the state. */
ds_publish_u32("open_counter", open_counter[0], DSF_OVERWRITE);
return OK;
}
static int
lu_state_restore() {
/* Restore the state. */
u32_t value;
ds_retrieve_u32("open_counter", &value);
ds_delete_u32("open_counter");
open_counter[0] = (int) value;
return OK;
}
static void
sef_local_startup()
{
/* Register init callbacks. Use the same function for all event types */
sef_setcb_init_fresh(sef_cb_init);
sef_setcb_init_lu(sef_cb_init);
sef_setcb_init_restart(sef_cb_init);
/* Register live update callbacks */
/* - Agree to update immediately when LU is requested in a valid state*/
sef_setcb_lu_prepare(sef_cb_lu_prepare_always_ready);
/* - Support live update starting from any standard state */
sef_setcb_lu_state_isvalid(sef_cb_lu_state_isvalid_standard);
/* - Register a custom routine to save the state. */
sef_setcb_lu_state_save(sef_cb_lu_state_save);
/* Let SEF perform startup. */
sef_startup();
}
static int
sef_cb_init(int type, sef_init_info_t *UNUSED(info))
{
/* Initialize the fb driver. */
int do_announce_driver = TRUE;
open_counter[0] = 0;
switch(type) {
case SEF_INIT_FRESH:
printf("framebuffer fresh: pid %d\n", getpid());
break;
case SEF_INIT_LU:
/* Restore the state. */
lu_state_restore();
do_announce_driver = FALSE;
printf("framebuffer: I'm a new version!\n");
break;
case SEF_INIT_RESTART:
printf("framebuffer restarted: pid %d\n", getpid());
has_restarted = 1;
break;
}
/* Announce we are up when necessary. */
if (do_announce_driver) {
chardriver_announce();
}
/* Initialization completed successfully. */
return OK;
}
int
main(int argc, char *argv[])
{
env_setargs(argc, argv);
fb_edid_args_parse();
sef_local_startup();
chardriver_task(&fb_tab);
return OK;
}
static int
keep_displaying_restarted()
{
u64_t delta;
u32_t micro_delta;
read_frclock_64(&has_restarted_t2);
delta = delta_frclock_64(has_restarted_t1, has_restarted_t2);
micro_delta = frclock_64_to_micros(delta);
#define DISPLAY_1SEC 1000000 /* 1 second in microseconds */
if (micro_delta < DISPLAY_1SEC) {
return 1;
}
has_restarted = 0;
return 0;
}
static void
paint_bootlogo(int minor)
{
paint_centered(minor, bootlogo_data, bootlogo_width, bootlogo_height);
}
static void
paint_restartlogo(int minor)
{
paint_centered(minor, restartlogo_data, restartlogo_width,
restartlogo_height);
}
static void
paint_centered(int minor, char *data, int width, int height)
{
u8_t pixel[3];
u32_t i, min_x, min_y, max_x, max_y, x_painted = 0, rows = 0;
int r, bytespp;
struct device dev;
struct fb_var_screeninfo fbvs;
/* Put display in a known state to simplify positioning code below */
if ((r = arch_get_varscreeninfo(minor, &fbvs)) != OK) {
printf("fb: unable to get screen info: %d\n", r);
}
fbvs.yoffset = 0;
if ((r = arch_pan_display(minor, &fbvs)) != OK) {
printf("fb: unable to pan display: %d\n", r);
}
arch_get_device(minor, &dev);
/* Paint on a white canvas */
bytespp = fbvs.bits_per_pixel / 8;
for (i = 0; i < fbvs.xres * fbvs.yres * bytespp; i+= bytespp)
*((u32_t *)((u32_t) dev.dv_base + i)) = 0x00FFFFFF;
/* First seek to start */
min_x = fbvs.xres / 2 - width / 2;
max_x = fbvs.xres / 2 + width / 2;
min_y = fbvs.yres / 2 - height / 2;
max_y = fbvs.yres / 2 + height / 2;
i = min_x * fbvs.xres + min_y;
/* Add the image data */
for (i = ((min_y * fbvs.xres) + min_x) * bytespp; rows < height;) {
GET_PIXEL(data, pixel);
((unsigned char *)((u32_t) dev.dv_base + i))[0] = pixel[2];
((unsigned char *)((u32_t) dev.dv_base + i))[1] = pixel[1];
((unsigned char *)((u32_t) dev.dv_base + i))[2] = pixel[0];
((unsigned char *)((u32_t) dev.dv_base + i))[3] = 0;
x_painted++;/* Keep tab of how many row pixels we've painted */
if (x_painted == width) {
/* We've reached the end of the row, carriage return
* and go to next line.
*/
x_painted = 0;
rows++;
i = (((min_y + rows) * fbvs.xres) + min_x) * 4;
} else {
i += 4;
}
}
}